Process of making metal castings



May 29, 1923; 1,456,868

D. CORDINO PROCESS OF MAKING METAL CASTINGS Filed Oct. 18. 1921 'ticing my process,

Patented May 29, 1923.

. UNITED STATES risaaea DOMINICK ed ma, PLYMOUTH, MASSACHUSETTS.

. rRooEss or MAKING METAL cAsrnvss;

Application filed October is, 1921. Serial No 508,512. i

To all whom it may concern/i; a Be itknown that I, DOMINICK CoRDINo, a citizen of the United States, residing at" Plymouth, in the county of P-lymouth and State of Massachusetts, have invented new and useful Improvements in Processes of Making Metal Castings, of which the following is a specification.

' My invention relates tothe method of making metal castings, and the object of my invention is to dispense with drilling and tapping screw threads in castings of all kinds,- and especially in gas, oil and other stove castings. E v

It is well known that in fastening panels to stove doors, and in securing together fixtures of various kinds in stove and othercastings for the purpose of conceali'ngthe fastenings on the face of the work, it is ens-- tomary to cast a lug or lugson the inside of one casting and to drill a hole in-the lug and then tap a screw thread therein for the reception of a bolt or screw. Thesemeans are subject to'a numberof objections, and among them are, first, the danger of forcing the drill through the casting and. thereby destroying or defacing it; secondly, of breaking the tap by not judging "the distance accurately and driving it against the bottom of the hole. 'In some situations it is awkward touse the drill and tap because. of difficult-y of access to the particular, position of the lug, all of which accentuates the risk of forcing the drill throughthe casting and breaking the tap, and also makes'it difficult of drilling and tapping in a true direction.

My invention consists Ora process of'cast ing metals for the attainment of the fore going objects, of certain novel devices-tobe employed in such process, and of the article produced by the process.

In the accompanying drawing, which illustrates someofthe devices used in prac- Fig. 1 is a perspective view of an attachment to the pattern used in forming the mold; Fig. 2 is a perspective view of a chaplet incorporated into the casting during the molding process; Fig. 3 is another perspective view of the chaplet and contents before casting; Figat is a plan view of-a' casting, molded by my process.

Fig. 5 is a vertical section of one of the lug-s 7 through the line XX in Fig. 6, which is an enlarged perspective elevation of one of the lugs 7 The first step in my process is to secure to --the pattern one or more attachments16; like that shown inFig. 1, madeof any suitable material, preferably brass-,-the numberand location of these attachments being "overned by the requireinents'ofthe particu ar casting. These attachments are inthe form'of a socket to receive the chaplet.

Fig. 4 illustrates a'casting designed to have another casting or panel'ysecured to it at-the four points indicated'by the lugs"(.. Ininolding such a casting as8, there would be four of the attachments16 secured .to the pattern in the same relation, of course, to each other the lugsf, on the casting shown in Fig. 4:.- Before making themold, a

chaplet 9, shown in Fig. 2, made. offsh'eet metal or other suitable material,- is inserted in'each attachment 16 on thepattern, but

beforedoing so a screwfthreadednut 10 is inserted in'the upper part of'the chaplet;

as shown" in Fig. 3, the hole in the nut coincidingwith 'that-in'the top ofthe' chaplet. Beneath-the;nut there is also deposited a core capable ofjloeco'ming disintegrated by the molten metal, but remaining intact during the molding process sufficiently to pre vent being displaced by the {molten metal. Below the core 11 is 'a narrowspace 12' as shoWn'in Fig. 3. 'The chaplet containing the nut, 10, and the core" 11, is inserted in the attachmentf 16 intheIpattern', with its I open ends adjacent to, the upright portions 13, l 3 of the attachment 16, whereby the moldlng sand cannot enter the space .12 in ing'withthe attachments 16 on the upper light and looselyresting 'in'the attachment 16, is lifted by the cope to which it adheres.

The pattern is then removed from the drag,

the cope is closed and the metal poured in the usual manner. The result is that lugs the cabinet-"9, during "the making of the I mold. Thepattern' isjthen"'placed in the molding-sand in the'usual mannerfor -cast-,

like the lug.7, are cast,.in which the space 1 12 in the ch aplet 9 is filled with metal which flows into the chaplet through the opening 17 and the core 11 is so disintegrated by heat that it is readily removed when the castings are rattled, leaving an gpen space 14.below the nut, as shown in g. 5.

Referring to the casting 8 in Fig. 4, each of the lugs 7 is provided with a screw threaded hole '(see Fig. 5). to receive the screws.

or bolts 15 for the purpose of securing anrately located, that all danger of defacing the casting by accidentally drilling through it is obviated, and as no tapping of the thread is required, there can be no breakage of taps. The screws or bolts 15 employed are selected with reference to their length so as not to extend to the bottom of the space 1% shown in Fig. 5. The screws or bolts 15, are readily removedwhen occasion requires separation of the castings for repairs or other purposes. A hole 1,8 is provided in the top of thechapletto admit the bolts 15 and the nut 10;

lVhile I have shown a chaplet made of sheet metal and prefer for economy to, use that form with a nut inserted therein, it is obvious that the nut need not be a separate piece, but the chaplet itself may have the top sufficiently thick to admit of a screw threaded hole, and such construction would be the equivalent of the separate sheetnie tal chaplet andnut and. within the scope offmy invention.

l/Vhile, it would be more expensive and inconvenient to do so, it would be some advantage to use a- Chaplet having sutlicient thickness of metal in the top to, receive a screw threaded hole, and having a core and a space below it, so that the hole could be drilled and tapped after the casting was made, and it, would involve a part of my lnvention the risk, oi drilling through, the cast ng or breaking the tap would be avoided or greatly diminished as the operator could:

usually discover by the: feeling when the Idrill or. tap had passed through the metal into the empty space.

My invention is applicable to castings of all shapes and sizescand, to the employment of bolts and nuts of anynvariety ofsize or shape. i a 7 It is clear that not only is there 3-, g-IEat saving inthe; production of the casting andan: advantage, in greater accuracy attained inthe location of the bolts and screws, but also the equipment required for drilling and tapping is wholly dispensed with in the manufacture of the finished product,

.What I claim and desiretosecure by Letters Patent is:

l. The hereinbefore described process of casting metals, consisting of incorporating into the mold a chaplet adapted to receive a screw threaded. hole in the top, and having a core in the upper portion of the chaplet anda space-below the core with an opening into said space, and then pouring the metal ,into the mold and filling said space and clos ing said opening with the molten metal and causing'the chaplet'to form an integral part of the casting.

2. The hereinbefore described process of casting metals, consisting of incorporating into the molda chaplet having a screw threaded hole in its top, and a core in the upper portion of the chaplet and a space beneaththe core, and then pouringthe molten metal into the mold and filling said, space and closing said openingv with the molten metal and causing the chaplet to form an integral part of the casting. I

3. The hereinbefore, described process of casting metals, consisting; of incorporating into the mold a chaplet having a screw threaded nut located, inthe upper portion of; the chaplet, a core located beneath the nut and, av spacebeneatli thecol re, then pouring the metal intlo thetmold and filling said space and closing said} opening, with the molten, metal and ca an integral-part of the casting.

' 4 In a metal casting archaplet having a screw threaded hole; in the top, combined with a; chamber located within. the chaplet and having no opening in its bottom through thecasting, l i c 5. Ina metalcasting a chaplet having a screw threaded-nut located in. the top, comusing the chaplet to, form bined with. a, chamber within the chaplet and beneath the nut, and having no opening in its bottom through'the casting,v

In testimony whereof I ha rej heneunto set my handfin presence of twofsubscribing'wit} ne-sses, thisffith day of October, 1921,

DO HN CK CORDINO.

Witnesses,: l EminRLBmoes, ARTHUR K. FINM 

